Peters



.(No Model.)

L. WADAOK & LGRAFFYQ HYDRAULIC DOOR 011301;. No.'322,218. Patented July 14, 1885.

. e a e 'r lil 6 N e co 275 7165565 1747/0220 7/"? jfqpgzmi a @Mw mama NITED' STATES PAT NT O FICE.

Lno WADACKAND ALOIS GRAFFY, or BERLIN, GERMANY.

HYDRAULIC DOOR-CHECK.

SPECIFICATION forming part of Letters Patent; No. 322,218, dated July 14,1885.

Application filed December 29, 1884. (No model.) Patented in Germany July 6, 188-1, No. 31,578, and in France October 13, 1884,

ject of the King of Prussia, and ALOIs GRAF- FY, a subject of the Emperor of Austria and King of Hungary, residing both at Berlin, in the Kingdom of Prussia, Germany, have invented new and useful Improvements in Hydraulic Apparatus for Preventing a Violent Shutting of Doors, of which the following is a specification.

This invention consists in a door-check comprising the following elements, to wit: Ablock to be rigidly secured toa door-frame, a swinging cylinder for containing a fluid, hinged to the block and provided at each end with a port connected by a longitudinal channel formed in the cylinder casting, and having an opening intermediate its ends which extends through the side of the cylinder, a cover surrounding the opening and secured to the cylinder, an adjustable regulating-valve arranged in the cover for controlling the passage of the fluid through the opening and the channel from one end of the cylinder to the other, a valved piston in the cylinder having a pistonrod, and a block for connecting the piston-rod with a door, all of which will be more fully hereinafter described in detail.

The invention is illustrated in the accompanying drawings, in which Figure 1 is a longitudinal horizontal section of my improved door-check. Fig. 2 is a side elevation of the same.

Similar'letters indicate corresponding parts.

In the drawings, the letter A designates a cylinder filled with a fluid, preferably glycerine, and which is pivoted so as to be capable of moving laterally to the lugs a a, formed integral with a suitable block, B, which block is firmly secured by screwsor other suitable means to the door-post on which the door is swung.

F, Fig. 1, is a piston adapted to work in the cylinder A, and it is provided with a transverse hole, b, which is opened or closed by a suitable flap-valve, t, secured to the piston. If desirable, several such holes I) and the same number of flap-valves may be used.

S S are ports formed at the ends of the cylinder, which are connected by a channel, 70, formed in the cylinder casting, and which regulation of the exit of the fluid from either 7 end of thecylinder to the other. The key E, by which the valve D is adjusted, can be removed after the adjustment is effected.

G is the piston-rod, which passes through a stuffing-box, g, and is secured to the piston F in the usual manner; and O is the connectingrod, adapted to be secured in a suitable manner in the lugs e f on asecond block, B, which is secured to the door by screws or any other means.

In the drawings, the parts of the device are shown in their relative positions when the door, (which is subjected to the action of a spring,) is closed, the piston F then being in the forward end of the cylinder, and the part of the cylinder A behind the piston and the channel is are filled by the fluid, the port S being closed by the piston; If, now, the door is opened, the piston is driven backward, the port S and flap valve 1; are opened, and the fluid is driven through the port S and the channel is in the direction of arrow 2, Fig. 1, into the forward part of the cylinder, while at the same time it alsopasses through the hole I) in the piston, the large areas of openings causing the fluid to offer little or no resistance to the piston, and the door is easily opened. When the door closes again, the pistonyis moved in a forward direction and the flap-valve z remains closed, and therefore the fluid can only make its exit through the channel It, the cross-section of which can be altered by the valve D, as before stated; and consequently the resistance offered the piston F can be increased or diminished at pleasure, and the motion of the door is checked accordingly.

We do not broadly claim a door-check composed, essentially, of a cylinder for containing a liquid or air, and a valved piston in the cylinder having a piston-rod; but

What we claim as new, and desire to secure by Letters Patent, is

A door-check consisting of the following elements, to wit: a block, 13, a swinging cylinder, A, for a fluid, hinged to the block and IOO provided at the ends with ports S S, connected with the piston-rod, substantially as nected by a longitudinal channel, 70, formed and for the purpose described.

in the cylinder, and having an opening, d, (222- In testimony whereof We have signed our tending through the side of the cylinder internames to this specification in the presence 0t 5' mediate of the ends of the latter, a closed two subscribing Witnesses.

cover, G, secured to the cylinder and sur- LEO WVADACK.

rounding the said opening, an adjustable regu- ALOIS GRAFFY. lating-Valve, D, arranged in and guided by the \Vitnesses:

cover to control the opening, the valved pis- J OHANN I-IENKEs,

10 ton F, the piston-rod O, and a block, 13, con- 13. ROI. 

